package cn.tedu.sp11.fallback;

import cn.tedu.web.util.JsonResult;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.netflix.zuul.filters.route.FallbackProvider;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.stereotype.Component;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

//访问OrderService时失败了 就执行降级的代码
@Slf4j
@Component
public class OrderServiceFallback implements FallbackProvider {


    @Override
    public String getRoute() {
        return "order-service";
    }

    @Override
    public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
        return response(); //这个response在下面定义的
    }

    //匿名内部类
    private ClientHttpResponse response(){
        return new ClientHttpResponse() {
            @Override
            public HttpStatus getStatusCode() throws IOException {
                return HttpStatus.OK;
            }

            @Override
            public int getRawStatusCode() throws IOException {
                return HttpStatus.OK.value();
            }

            @Override
            public String getStatusText() throws IOException {
                return HttpStatus.OK.getReasonPhrase();
            }

            @Override
            public void close() {
                //什么都不写
            }

            @Override
            public InputStream getBody() throws IOException {
                log.info("fallback body");
                String s = JsonResult.err().msg("调用订单后台服务器失败").toString();

                return new ByteArrayInputStream(s.getBytes("UTF-8"));
            }

            @Override
            public HttpHeaders getHeaders() {

                HttpHeaders httpHeaders = new HttpHeaders();
                httpHeaders.setContentType(MediaType.APPLICATION_JSON);
                return httpHeaders;
            }
        };

    }


}
